The lectures of Nobel Prize winning physicist Richard Feynman were legendary. Footage of these lectures does exist, but they are most famously preserved in The Feynman Lectures. The three-volume set may be the most popular collection of physics books ever written, and now you can access it online, in its entirety, for…

Richard Feynman was obviously famous for his work as a physicist, but he's also widely regarded as one of the most lucid and effective lecturers to ever address an audience. So renowned, so readily accessible were his presentations, that his introductory physics lectures (which he delivered to undergraduates at…

If you've ever wanted a world-class introduction to the basics of artificial intelligence, here's your chance. Every fall, engineering students at Stanford University can enroll in a class titled "Introduction to Artificial Intelligence." And now you can, too.

In this simple demonstration of how waves work, a Harvard instructor shows how a group of pendulums can move through a complicated dance together — due entirely to the way each pendulum oscillates at a different rate.

The Euhaplorchis californiensis is a little parasite who lives in Southern California. And in this movie, released last year by researchers with the USGS, we learn why its lifecycle is the stuff of nightmares.

In this film, taken a couple of years ago from a rocket booster on the space shuttle Discovery, you can see what it's like to blast into space, shooting fire and whirling back into the upper atmosphere.

If you haven't heard of Mavericks, that's because it's a tiny beach on the Northern California coast. But scientists and surfers know it well, because it delivers some of the most spectacularly huge waves in the world. Find out why.

Watch as Earth becomes a mega-snowball, just like it did 650 million years ago! To watch this video properly, you have to yell "dude!" every time a scientific fact is followed by a dramatic reenactment where the WORLD IS DESTROYED.

For thousands of years, a fist-sized octopus called the argonaut has baffled scientists. Even Aristotle wondered why this creature wraps its body in a thin "paper nautilus" to swim. Now, video evidence suggests these creatures have a highly-sophisticated ballast system.

Now that we know octopi like to play with cameras, it's time to investigate other forms of animal play. Did you know that rats laugh when you tickle them? This scientist has proof - and it's pretty damn cute.

Every day, the cells in your body are dividing like crazy - sometimes too much, which is the definition of cancer. Here you can see breast cancer cells in action, multiplying into what could become a tumorous growth.

Created by Cristóbal Vila, this video manages to explain how everything, from snails to flowers, is built according to predictable mathematical principles. Numbers have never been more sublime. [via Etérea Studios]

A group of researchers has created "Skinput," a device that turns your body into a touchscreen by sensing movements in your skin and muscle. Witness the future of the mobile - literally in the palm of your hand.

When astronauts spacewalk, it looks like they're floating serenely in the vacuum of space. The reality: they're hurtling at 17,220 mph inside bulky pressurized suits. Here's the lowdown on spacewalking, from how it's done to what it costs.

It may not be Lex Luthor's earthquake-causing missile, but the earthquake centrifuge at UC Davis in California is the next best thing. It's a giant robotic arm that can cause horrific earthquakes, all in the name of science.